Both a [2]- and a [3]-rotaxane have been synthesised in good yield by slippage at 55 °C in acetonitrile of bisparaphenylene-34-crown-10 over size-complementary stoppers on a dumbbell-shaped molecule containing two 4,4′-bipyridinium recognition sites.
P. R. Ashton, M. Bělohradský, D. Philp, N. Spencer and J. F. Stoddart, J. Chem. Soc., Chem. Commun., 1993, 1274 DOI: 10.1039/C39930001274
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